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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2087cbedf81cc6a4bc3b7efe98a27fc04fcda3a70ac26ec88e4c6a8234f8cbb8' 
  AND token = 'OP7Gi+i9Ws0H088rI6XU5TmkyStgKVs971FWWVEih5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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