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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c3e5c54fe88b99daa2a6fe59b3693743574eb6687a15b4476b74d1f310ba77fb' 
  AND token = 'W4TymWP5R8kKs7SZ+RQxvbtcDbZmu3TlZJL/gR8fS30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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