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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b00f858bcc5b20354c731cc6199cb6971073ba8394c40b8c1d312b8cc4893818' 
  AND token = '84BnhGITzb+6LRZDdNI5qNd8pFg0889sp24osZzAEPk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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