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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '86bbd93168c9145e20a33b67742db99aaff89b4b7e2a32b645613a1d8160605f' 
  AND token = 'x4cvLsmNpiAE7ROVWbxDi14mwd9wUAeTKqfXUquZyGw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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