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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1e8a6d6e01e2214a41eb82ddd9f110b69ce0013f6ce94fd8156d530fb8b3afaf' 
  AND token = '0o3bHfoP06n2A1uluIq5DibfbfkmOTVijrDht9rfw6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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