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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f5924de77cb7a26eaddd1c3bd176cc487b9cea50a9b575e201157744112b96a3' 
  AND token = 'yG9CEY2Ci/6xFY6XZyDJVll2I80UoaYee3/ZM1iUOP8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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