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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e553c77cdfc45f677806ca2221e5dc068b81e935a994d640a4f063aac4b75644' 
  AND token = 'OBNMCL5m2fzkFXoiZ5UqHP4eoucdHvPvqqDbHa3aAI0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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