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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '54c394b5165c00238117856bddb41996b834134c9da2810eb2007a406c5d235b' 
  AND token = 'oNH5NJ7C3GfU12oGwee54XqM8i8eVTMH64Zog8fe2+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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