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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3910077d4f9fa2fbac6ec738a2aca06e9f457934f9957614114089f06741294f' 
  AND token = 'FH3aDpMEa3KhlmpCbuP04vBtSxdc98F6PPGkZ+BziLo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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