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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '303cae5fcb6fd82f61e88a42ce4dd8dc7fe2219d21453a37d16c9604172bd54c' 
  AND token = 'IE0diTllgsOyVq9DTW8C4rIi8cLVT6YA7LtQh3zgfiE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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