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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e33027db061426c883b6dfc2de1b8b511e1391214f380de0855a1ca33b11561f' 
  AND token = 'Bip+rA8Mv5DDXICjK0Rffzf7rLtqetpjZcrxzd3hngw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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