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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3ea0973c83decd648904bf22b0571ba60acf8dbbe8ce1ed0d76dce5d540a127a' 
  AND token = 'SCSfzH7tzRC095S6lb4eJbGH/EGXCLpUE0gkboFXTds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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