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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '57453544bd50995bf464e1dea582aa916fd0572108c35923b118f28b84dc456c' 
  AND token = '/r4LuBgNeEi3UZH+cQ2UmW1KutNEx89MDrtn3R8C2LU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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