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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '94780aa836ae93a41b23f6298262f60ce2d15e03ea0c4b4dd2a19f7741bd4ffd' 
  AND token = '0HNNj91BnfuuS4gm8KJCS1zD3cCB+gdkFqzmran/Xes=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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