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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2c797f7ab4d98e1e0ee8a2bb3f9ddb2606bffeaf802d4746a14fa60a3154f1a7' 
  AND token = 'RSJ3PzPEEqERgHW2D3IqqLxkI8xR6k1jo64MI+VNRBo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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