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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ec787a424079abdac518cab9beb0ba86f8e445694a0702786a60312b281129e8' 
  AND token = '1o2IvUp9L8wAOcHXGmPL2xEqNmy0Go1XhOLEiPYT2Rc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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