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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '446b1c71901d01ebac824a48620afffc2ca62bc1fac654a23b371bcf6783feda' 
  AND token = 'sY5rhNMFsa1eFrEmDuffGF5KcxxQiMNcs9LrgXQsvb8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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