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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '47801265678ba0a3185cfa03f44ac9128a55c5b08694e8f3790bba06929696e2' 
  AND token = 'J5l0RA6Pr0L7kW/kjUCe9taxr8PcW+DX5KlQ9xA21fY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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