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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '32b46a39dc176607837e70e281d6f046dd7faad131de137342e57ded6c791721' 
  AND token = '0eFxHSqBef2a2nXorGCoJmdb3xySQtdn4x3wYlguZK4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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