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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4c4645666c973ec81e22956c5a95f1c2d5b1193872afea00a60d0d8edb17680d' 
  AND token = 'Acod2L6T8nAxsnAdyYab3pDfJDBf0cIiZfEhPjU4yZA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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