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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b05e999e4f0fc30d676121bb4152d638ac12303ef0a29a6fa612e6bee8794865' 
  AND token = 'Cnp/P55At9MqmnIBzsMryup0naWW2OClVpcwSOVNndk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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