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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '62e3361a028bd5a4f24b5049e0bd7f6af309fe1d036c017cbcbe0be90df1174d' 
  AND token = 'hBv6+ZOuzv3fNK080yehQoiIAODh0iijefqB1Y4DbZA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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