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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a0eecc319e046a355d17fc0812b981cebc7197c5368f6b6ff696479468c38a2d' 
  AND token = '2AldYjdPLuBJq9mEa5sCKoS0f4kafJ1d0yfrhrZEQ1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}