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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bc13bb7b817e7564381df177346debde3f2faab7da9e3b6a5812069b09f835e4' 
  AND token = 'I16kg3azAkjpDtig/kotM1hbXwiYq8RwAEiQqi9ZRyc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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