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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '95be8781baee4ddf0102c1c50a1c40ef7bc6daae7c267be6666874e7cf0f2218' 
  AND token = 'uFva8nhedmdY9WtA3Y3U1yrErlH1vcMVKrJmV+poSLc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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