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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e12ddf847ffa5bd5039261a74a68398ab5e2ac429d380a47480c14c01aabfba1' 
  AND token = 'k00Aaj4W7NXToTGWqyOZuPci53wTZrHoK5wwmj3M81k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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