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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '18606570d3c0bc3b2fb28557ba746252d0b5b08c0d0632a988ca5079bb4e7be7' 
  AND token = 'JFOftTL4cXzLN96sMJ/c4FcC3++WAP052QGWcnyH2r8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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