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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5c797fdc8c6c16afc5a1d5947dbb4238a49c5aa25580ec5861e2063bfbd53abf' 
  AND token = '7um5u5sZv5IkyHk6+z2LK/RXSq7rxHqsn2yaZTlJdJ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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