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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a5978cb30efd4b57b2eec5bc041da0106b622a34d4bd1a143e0a62f3bda116f5' 
  AND token = 'TkF/Q7YyoUZUb0aacWb6b6mwaPy3glvsMhDYhopk6N0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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