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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b400ed07bde5b862793127263b145dfa7c57316868cbfc63c8d3d7e0cb716b8e' 
  AND token = 'h0F/sEEE2PVUt6fW8xay90RNER3T/4W/DFxv6TTWdI0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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