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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '391f8df364f9870d58d475a77210ea5e0baef948ecf87f6d8a1c571473659626' 
  AND token = 'EeSt11NfStOTMDYt4wgRjbbk9mw+urezuHzsdv37t88=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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