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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ecc433cecda91f44da8fb8827f17c8d3a41a7b9502e794ff471daae7277b8550' 
  AND token = 'Ly+2MO1EVOIWActMaZHGxmwx2w7CB5ufk4ee9925ryw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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