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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6c38a4b5e7725788ccd1faadf947b09e53592673cab3a27268fe88987ba6eee1' 
  AND token = 'gK5LEx+ECcWd5c819T5lC0gPegFpfAWGAvrkRpEWehA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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