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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '15c01d707ef0895c24711b3249c72cc5982efa4b561e93824c81298bf6eedc69' 
  AND token = 'MfaBHxBKO0XRG/FUJBB52nRKJZf/0XOabRf761McUYE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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