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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f03d5e6700ce8bd3441b4ca620272b2eb7872f613199d8b2e7272ff6714ff654' 
  AND token = 'Ro07Dhy12PsfKiXH4lGEt9A0IHYDOP6gr7QQwk4m7cc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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