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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd2c4f80f18f48ed60e00a0ae03fae90014212372382710a8621c69a27ff51317' 
  AND token = 'CzIU7Lal7PDfaaLC4nFdf8RhpWvuVQ6jRpBVuG6UBTY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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