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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b0152215b1d787c129a496f2e3dce7751c39a77ac9d5b1da7e0fa402a70c2051' 
  AND token = '6fH7vVtOFISdMT6aoDDFsCVxvaFXtg0NtVMislmCAmk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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