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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4d95c58dae03c8fcd1de7fe096cbdf72c31ca159a29b40623d5522eee343faf4' 
  AND token = 'bzEo6dl7OCuc86R8uddln0SDb3fXX/Q0XsW63Io9e8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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