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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8d4a88972e302a3120bc962008efe9759cbeab9cf74f2f10d1ba19a56fe8094c' 
  AND token = 'pHe56fAKe+J9mtz9IbmLm3XIkqtWUez2GBqgJOg6fqg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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