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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ed35e7b2b0a6528f95fff6d579d7b37e630d1ab40a190d123ae4d2f59c467c82' 
  AND token = 'fntiOSm2OeCF5QhJwJDAL0e1oYqloyxgqfASAj94ysI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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