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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '84951de9a97b4a78b9d42a1f51d8954ad97fdda861f89048eb33454982366662' 
  AND token = 'k5lHr5MhOd5uApPgQsZEd+zxH9oEythRwfxXmmywQZk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00088

JSON explain

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