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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '62f2869c2d782e7cb508a948eae2d1bf0aefdb0a25e36fb824f3fa10fe135f5c' 
  AND token = 'yZKveoyg9kXgXRoOj0qwu0PkLtE1dbJ6sQstPSVx/pU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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