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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '165c292555010997e109bb03ad7aab90de5813c4912027534620194d1eca7875' 
  AND token = '1eiD1/ybaaZvb7YKVa/6ICdEUkUS/VG8ajhwKkpXThQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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