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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8dce788c17f12925c2ebca3c71ca80b5a12dc4a05af638d46467a9474cba4122' 
  AND token = 'r0X0Q1PQYxh0R6K7ysXRM/yYVxYhsGh+TM1KV+Rb25I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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