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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1f40977a4cf3c2d42b3dabaacfa13b4ca74651d43d4888907cd5e375b10615f8' 
  AND token = '4U9WlCqycKqDuVOsG/0/gbQqWfvgaqyyyr9GyQprgdg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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