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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a89a62d64292a14be7d1af042a8539380ee506283e68e720b90d5bb380a827dd' 
  AND token = '3Jvn1ESnnpMU+362F5xR9By8XLKzTKkWbZNpxTguBFo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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