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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e7a9fead8de9ba6232baf00bcd4edb3a2d4e2433bc263d3108505fb7757a37ed' 
  AND token = 'l3bthKhowrVeT0jdMiNWumUwQC5EFFZ0RLluEeiisnc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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