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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '76c4ee0f32e1ba93b3055c07f3bedab610945b3226151fa91b27fceb660851c0' 
  AND token = 'OQuXAzukT3cjw7WjnWeIZj3oOPQt/koEEYFDE5MJ1D0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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