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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4ac07669885505a108a043d39a129886f7a53f22a4a848cba5934a38f1c7abea' 
  AND token = 'ZVN3c+SmLX3HmVk48vLl2cvHRASw9VOqfFC/sONu2l0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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