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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6c3037074610ef424b488e78d5ede30cda26620d8e7305e94253dd925c1a542c' 
  AND token = 'E27+QHZqBHIAf4S0KSSqw86M9PjFm7ORBNrpPtrVmAg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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