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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1aa5ce89400f0a63b6948bdcdbb6f0682a1dd8d1e608ee71762a3e0d186a620d' 
  AND token = '0L5P5MpQ1vQ8osLBk0eB8lMODCtbMqwbxYi+n/8Tis8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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