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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '94b256490eccdc1fa4073bd5269aa00238e99cf31d6801ed68b8631c7dfe2f92' 
  AND token = 'r/lxI3Sp/kCBSfG07GpJtffqtnPWF44D8vLib56GQWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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