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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2722c6acd24c3e7f30394e6082ba5012ea3044a3334b770abf6e34f29698d7b9' 
  AND token = '3xaV/cUd6H00QeZwrosB7kn9HI1o24sv3pu/dmbRuE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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